Work guard



April 22, 1930. w. G. MUELLER 1,755,265

WORK GUARD Filed April 16, 1928 2 Sheets-Sheet l 27 J )9 F ill .11)" lIIII II:1:11:12:. TffffIfffIflIIfif. I

w. G. MUELLER April 22, 1930.

WORK GUARD 2 Sheets-Sheet 2 Filed April 16, 1928 awed/neg i consequence vdistresslng accidents have l1apc rp'enedby, reason of workmens clothlng be- Patented Apr. 22; 1930 i new c ,In that typeoit' metal working machine, in

part of this' bar stock projects beyond the machine and 'rotatedandexposed, As a fconiing caught by the: revolving material.

' T: The object of the present invention is to provide a guard thatwill-hous'e'the exposed j portion of the work and yet isni'ovable out i altering the machines for different kinds of of the way for the purpose of preparing or work.

Another'and important object is to provide mechanism whereby the guard must be in its proper operative position before the modified form of guard.

7 position. 7

machine can be driven. Y

In the accompanying drawings: Figure 1 is a view in elevation and somewhat diagrammatic in'itscharacter of the chuck end ofa metal working machine and thenovelguardassociated therewith. v V 1 Figure 2 is a similar view of a slightly Figure 3 is a detail elevation on an enlarged scale of one of the supporting standards and the housing-carried thereby.

Figure 4 is av'ew at right angles to Fig ure 3.

c Figure 5 is a detail sectional View showing the head and guard in its inoperative posiw tionand illustrating the circuits controller.

Figure 6 is-a View similar to Figure ,5, but showing the head and guard in its operative Figure 7 is a rear elevation of the upper portion of the supporting standard and head;

The metalworking machine is ofany known or desired character, so long as it will operate on long bar stock.- Therefore only the chuck structure is indicated, and'this is a designated generally by the reference numera1 8. Itis electrically driven in a welliknown manner'for the purpose of rotating the bar stock, whichis shown at 9. Usually in these machines there is a feed sleeve 10 that is removable from'the rear end of the chuckstruc- :ture and isir eplaceable with other sleeves havingboresof different, diameters'for the pun Application inee'e rii s,

woniz GUARD 192a Serial m5; 270,429. ,1"

exam ner nnrivna ooronieno, ASSIGN OB TO GARQDLiEB-DENVER COMQ ePANfibE EN IER, coLon-Ano, A comeonnrrolw on DELAWARE pose of permitting 'the-machineto used I with stock'of difierent cross sectional-config- 7 uration and size l Located in rear of the machine is supportl-c ing'means, which may be 1n theform of one or 1 more standards. "One of said standardsis:

shown in'Figure 1' and'is designated general 1y 11. Two standards are illustrated-in Fig- -ure 2, but as these are similar in all respects,

they are given'the same reference numeral; The standard consists ofa tubular base12, in which is slidably fitted the lower end of a standardbody 13, having a flange '14 that overlies the base '12." Through this flange are threaded adjusting'bolts that bear upon lugs 16 formed uponopposite sides of the base 12. The'standard body 13is thus vertically 1 v adjustable. Fitted into the upper end of the body 13 is a'cap l7 to one side offwhich is hinged,- as shown at'1 8 a head 19,- that is adaptedto restfflat upon the capf17, or'be swungrearwardly to "one side ofthe same. 'ItS rearward-movement is limited by abut-'- inents 20"carried'respectively' bythe cap and headand located adjacent to the hinged'connecti'on, The' head is secured upon the cap by a swinging retaining bolt 21 that is pivoted j at-22'to the cap, and engages in" a slot 23 formed in the free side of the head; A a

clamping nut24 is arried the bolt 21: and

elongated sleeve2'6 secured in the collar by a' suitable set screw 27. Asiaboveindicated,

The head! includes a collar 1 25' through I which extends a housing i'n'thefform of an thilsfhousingmay be carried by one standard ;.only as shown in Figurely or maybe sup V prtedon two or morestandards, asindi-v catedin Figure.2.- .r r. we

o Thet'cap 17 is provided with;so"cketl28,'

in ,which an electric circuit controlleris I placed. This circuit controller 'may include terminals 29,?with; which cooperate other 3'O ojut ofengagement with the contact e1e-' 'terminials carried a vertically moving 1 plunger '31 'rnounted inythe j socket 628.; jA

i spring 32'insaidsocket,normallyholdsithe 'plungerelevated with the contactielements pressed and the elements 29 and 30 are in electrical contact. An electric circuit for the driving motor of the chuck structure 8 switch 35.

is diagrammatically shown inFigures 1 and 2 and includes a'source of electrical energy 33. An electric circuit includes said source of electrical energy 33, the driving motor for the chuck 8, the circuitcloser 2932 in the cap 17, and the usual manual With this structure, when the head 19 is onthe cap 17, the guard housing 26 is alined with the chuck, and a bar of stock placed in said chuck has the rear portion which projects therefrom housed by the sleeve, as indicated in Figures 1 and 2. As a consequence the freely rotating projecting bar stock is covered and no one can come into contact therewith and be injured thereby. Should it become necessary to remove the sleeve 10 of the chuck or gain access to the rear end thereof for any purpose, the housing can be 7 swung to one side and is then'out of the way but the machine cannot then be operated be cause the circuit closer 2932 is open. Careless workmen therefore cannot leave the guard in its inoperative position and run the machine with the bar stock exposed. They must bring; the housing into itsoperative position and then it becomes necessary for him to insert the bar stock through the housing into the machine so that said stock is bound to be covered whenever the machine is be apparent to those skilled in the art without further description and it will be understood that various changes in the size, shape,

4. The combination with a metal working machine having an electrically driven rotatable chuck for holding bar stock, of a support at the rear endof the chuck, and a housing for the bar stock projectingfrom the chuck, said housing being movably mounted on the support, an electric circuit controller mounted on the support and actuatedby the housing, and an electric circuit including the chuck driving means and the circuit controller.

5. The combination with a metal working machine including J an electrically driven rotatable chuck for holding barstock, of a standard located in rear'of thechuck, a 'oir-' cuit controller including a movable member mountedin the top ofthe standard, a head hinged to the top of the standard and adapted torest thereon and on the movabletmernher of the circuit controller to close the same,

and anf'electric circuit including the driving means for the chuck and the circuit closer; In testimonywhereofil afliX my signature.

YVVILLIAM Gr. MUELLER.

proportion and minor details of construction may be resorted towithoutdeparting from 7 9 the spiritor sacrificing any of the advantages-of the invention.

What I claim, is:

1. The combination with a metal working machine having a rotatable chuck: for holding bar stock, of a housing for theportion of thebaristock that projects from the mach ine,'and means controlled by the housing 7 for controlling the operation of the chuck. 1

tainingtheportion of the bar stock that pro jects fromthe machine, and means controlled,

by "the position of the housing for control- "ling theoperation of the chuck,

1 2.. Thefc'ombination. with aimetal working 7 machinehaving' a rotatable chuck for hold- ,7

ing bar stock, of a housing movably supported at the rearendof the machinefor con- 1 3; The combinationwith a metal working 1 machine having an electrically driven rotata- .ble chuck for holding bar stock, of a guard I movably mounted at the rear end of the I. chuck, and an electric circuit including the I 

